railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Chemistry in Everyday Life

Which of the following claims about chlorofluorocarbons (CFCs) is accurate?

1
CFCs are used as repairers of the troposphere
2
CFCs are used as fuel for air crafts
3
CFCs are used as repairers of the ozone layer
4
CFCs are used as refrigerants
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